Moen Flo 3/4 in review
Moen Flo Smart Water Monitor and Shutoff, 3/4 in (900-001)
By Tom Calder
An in-line valve that watches flow, pressure and temperature and can close your main automatically. Moen recommends a plumber because the main is cut.
- Best for
- Whole-home auto shutoff on a 3/4 in main
- Skip it if
- Your main pipe is larger than 3/4 inch
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Automatic shutoff plus app alerts
- Keeps protecting if Wi-Fi drops (maker)
- Insurance discounts may be available (maker)
Worth knowing
- Plumber install, cuts into the main
- Needs an AC outlet within 10 ft and 2.4 GHz Wi-Fi
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Who shouldn't buy this
Don't buy it if your main pipe is larger than 3/4 inch.
Key specs
| Pipe size | 3/4 in or smaller pipe |
| Install | Plumber install (cuts into main) |
| Detects by | In-line flow, pressure, temperature |
| Connects by | Wi-Fi 2.4 GHz + AC power |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Whole-home auto shutoff on a larger main
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.Best for Whole-home shutoff with freeze warnings
See the comparison →
Best for Main shutoff plus point-of-leak sensors